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Abstract
This study was designed to define sonographic characteristics and the optimal sonographic
technique for localization of the single rod Implanon™ system.
Diagnostic ultrasonography was performed in eight women who had the Implanon rod implanted
in the medial aspect of the upper arm. All implants were scanned in the longitudinal
and transverse direction using 3.5 MHz, 5 MHz, and 7.5 MHz linear array transducers.
Scanning was performed both directly against the skin and with 2 and 4 cm Kiteco™ ultrasound stand-off pads. Each image obtained was evaluated for detectability of
the Implanon rod and the grade of acoustic shadowing produced by the Implanon rod
by two independent observers. Discrepancies in evaluation were adjudicated by a third
observer.
The Implanon rod implant was not directly identified using the transducer and standoff
pad combinations. Implanon rods were indirectly identified as a result of the posterior
acoustic shadow cast by the Implanon. Best demonstration was achieved with the 5 or
7.5 MHz transducer and a 2 cm stand-off pad in the transverse direction.
Appropriate ultrasonographic technique and familiarity with posterior acoustic shadowing
patterns generated by the implant provide a noninvasive method for localization of
nonpalpable, single rod implants prior to removal.
Keywords
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References
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Article info
Publication history
Accepted:
August 25,
1997
Received in revised form:
August 22,
1997
Received:
May 2,
1997
Identification
Copyright
© 1997 Published by Elsevier Inc.
